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Question

Two stones are thrown vertically upwards simultaneously with their initial velocities u1 and u2 respectively. What is ratio of the heights reached by them (Assume acceleration is g downwards)?

A
u1:u2
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B
u21:u22
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C
u31:u32
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D
None of the above
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Solution

The correct option is B u21:u22
We know for upward motion v2=u22gh
h=u2v22g
At highest point, v=0
hmax=u22g
For first ball, h1=u212g
For second ball, h2=u222g
Thus, h1h2=u21u22
h1:h2=u21:u22

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